The Approach of Freeze-Drying
Freeze-drying is a sophisticated process of preserving new or presently-cooked foodstuff by getting rid of up to ninety eight% of the food’s humidity, leaving intact the food’s texture, flavor, aroma and dietary benefit.
The process demands that the clean or cooked foods be rapidly frozen at temperatures as lower as -50°C. The frozen meals is then put into a vacuum chamber. This vacuum chamber lowers the strain, and raises the temperature to just about 0°C.
At this specific temperature and strain, the ice crystals in the food evaporate into water vapor, bypassing water’s liquid type, via a procedure named sublimation.
This approach preserves the cell composition and dietary content of the foods, ensuing in a solution that, when rehydrated, very closely resembles the original food.
The method also prevents the h2o from currently being reabsorbed by the meals and therefore decreases its excess weight considerably.
Most foods products this sort of as fruits, vegetables and meats are nicely-suited to freeze-drying, and can be utilized for long-expression foods storage and preservation.
The Approach of Dehydration
Dehydrating foodstuff is a foodstuff preservation method which has been used for generations. Native Americans dehydrated their buffalo kills in their searching camps to make it easier to transportation. Pemmican (a dehydrated concoction of buffalo meat blended with body fat and berries) was a staple of numerous of the nomadic North American tribes. This low-heat dehydration approach associated both air drying (with close by campfires), or sun drying strips of meat on drying racks.
Dehydrators are a contemporary technique for little by little getting rid of the humidity from foods with out actually cooking it. A downside of dehydration is the restricted sum of foods which can be dried at a single time. The good factor of dehydration is that this approach of processing for foodstuff storage can be very easily completed at house.
How Do These Two Strategies Influence the Foodstuff?
Freeze-dried foods maintain much of the unique shade, shape, aroma and freshness of fruits, veggies and meats. Freeze-dried foods does not typically contain additives or preservatives, so it stays correct to its authentic kind. And the appear, texture and taste of the foods stays after re-hydration.
In contrast to reduced-heat dehydration, freeze-drying enables for the preservation of pre-cooked foods, including recipes these kinds of as soups, stews, stroganoff, and the like. Andrea Grocer is that since the food was ready in its entirety prior to freeze-drying, all you require to do is merely insert h2o, then warmth for a couple of minutes in purchase to produce luxurious foods.
Rehydrating freeze-dried foods takes just a handful of minutes, simply by incorporating boiling drinking water. Some food items, like several fruits and veggies, want no re-hydration just before taking in.
Dehydrated foods shrink throughout processing as the dampness is taken out. So the foods merchandise alone is considerably more compact than its first dimension.
The re-hydration time of dehydrated foodstuff will take a little bit for a longer time than freeze-dried, but it stills tastes like the first type of the foodstuff. Some dehydrated foodstuff contain extra ingredients to boost flavors or aid in preservation. As with freeze-dried fruits and greens, dehydrated fruits and veggies can be eaten without any re-hydration.
Both methods of foodstuff preservation increase the lengthy-expression storage existence of food. Most commercially developed freeze-dried and dehydrated foodstuff have a shelf lifestyle of 15 to 20 many years, if effectively packaged and saved in a awesome, dry environment.
In addition to their being a reliable source of food in an crisis or lengthy-phrase survival state of affairs, simply because of their light fat and relieve of portability, these foods are also wonderful for taking on camping, hiking and searching outings. They are also a wise option to hold in an emergency highway-facet kit for the automobile, or in your bug out bag.
If you choose to preserve these food items in your car as element of an unexpected emergency kit, you should keep in mind to rotate them periodically. Temperatures in a auto can attain extremes, the two sizzling and chilly. Large warmth as nicely as steady temperature fluctuations add to quicker degradation of equally dehydrated and freeze-dried food items.
Which Sort is Greater for Use?
Everybody is different, and each and every individual has their possess personalized preferences and tastes. With that in brain, there are a couple of things to consider before generating a determination amongst freeze-dried or dehydrated foods.
Residence-developed fruits and greens are greater preserved by means of dehydration, because the average particular person can not manage the costly machinery utilised in freeze-drying.
Food items utilised in every day cooking and meal planning need to probably be freeze-dried. This permits the food to be quickly re-hydrated as it is cooked prior to serving. If accessibility and portability are critical, than possibly kind of preserved food need to meet up with individuals specific wants. When once more, it really is a issue of private tastes.
In a nutshell, both dehydrated and freeze-dried foods are exceptional selections for lengthy-phrase meals storage, as properly as for day-to-day use or for climbing, camping, and many others. They equally offer mild-excess weight, transportable, practical meals. The main big difference is that freeze-dried meals are inclined to greater preserve the shape, texture and flavors of the first food.
Most folks will uncover that a mixture will operate ideal for their needs. Solitary-item meals these kinds of as vegetables, potatoes, and other staples and grains are properly-suited to reduced-heat dehydration. Freeze-drying is more appropriate for meats and fruits (whose texture can be preserved), and for pre-cooked foods with a variety of substances this sort of as soups, stews and sauces.